used imagerezier.com to batch-convert images. worked fine, but the problem is that it adds extension "jpg" in addition to ".bmp".

For instance, consider file-name: "Picture.bmp", after conversion it becomes "Picture.bmp.jpg", but I want the name to be "Picture.jpg", as the file-path has been hard-coded in the program(Custom-software) as "filename.jpg"

I just used irfanview to convert Picture.bmp to Picture.jpg. Choose the option "batch conversion". If they are all in the same directory, just click "add all" in the options and set what format you want to convert to and click "start". Specify the same or another directory for the converted images.

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